Here's why:

* Hormones are chemical messengers produced by glands within the endocrine system.

* These hormones travel through the bloodstream to target cells and organs, influencing a wide range of bodily functions.

* The endocrine system regulates vital processes like growth, metabolism, reproduction, mood, and stress response.

Examples of endocrine glands and their hormones include:

* Pituitary gland: Growth hormone, thyroid-stimulating hormone

* Thyroid gland: Thyroid hormone

* Adrenal glands: Cortisol, adrenaline

* Pancreas: Insulin, glucagon

* Ovaries: Estrogen, progesterone

* Testes: Testosterone